Question

Let A(2,-3,0) B(2,-1,1)C(0,1,4) be the vertices of triangle ABC. Then angle between the median BD and the base AC is
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Answer 1

Answer:

D is mid point of AC

So, D=(1,−1,2)

BD  =(−1,0,1)

AC =(−2,4,4)

BD . AC  =∣  BD  ∣∣  AC  ∣cosθ

θ=45